Heatsinks for Bosoz?

[jleaman]

I guess we will be able to track them throughout the world as they arrive!

Any one going to post some pictures ?

 

[lgreen]

ps question

Good to hear.

Hey, if I use my power transformers from the original bosoz, will the secondaries be too high to safely use Kari's power supply boards? I'm thinking that the negative supply, instead of -80 is only -12 or so right? (might have the #'s slightly wrong)

 

[steenoe]

Hey, if I use my power transformers from the original bosoz, will the secondaries be too high to safely use Kari's power supply boards? I'm thinking that the negative supply, instead of -80 is only -12 or so right? (might have the #'s slightly wrong)

Nope, you cannot use the 80v for the 12v sec. You need another trafo for that!

Steen.

 

[steenoe]

Any one going to post some pictures ?

Here you go

Steen

 

[rebojorge]

beautiful!!!

Kari... will you be able to send me 4 boards instead of 3...?

 

[promitheus]

Absolutely wonderful !
How big can those output capacitors be?
If anybody is interested in Mundorf Caps I can get them at a very good price. Just have to get a few people to order.

 

[dhole]

Thanks Kari! Got my boards through.
regards
dave

 

[rwagter]

beautiful !!!!!!

promitheus, which mndorf's, how much ?

Ralph

 

[promitheus]

Well I can get any Mundorf.
The choice would be Mcap or MCap Supreme.
10uF or 22uF
It all depends on what fits on the Boards.
I dont have them yet so I dont know the dimensions.
Does anybody know the maximum pin distance of the caps and maximum width?
Also a good choice for the electrolytics would be Panasonic FC and Panasonic Snap in for the power supplies.
Which MKP caps do you guys prefer?

 

[trango]

promitheus

That sounds interesting, I think I'm intrested if the price is right..??

/trango

 

[harryeng]

Hi promitheus,

Do we all need to order the same caps, from the same series?

I'm in.

Greetings,
Harry.

 

[rwagter]

40x60mm

 

[promitheus]

There aren´t so many choices anyway.
I will check which ones fit on the boards and then see how many people are interested.

 

[dhole]

Kari designed the boards around using mundorf caps. thus 4.6-30uf

 

[dhole]

The footprints for the caps are Mundorf MCap 33uF + some odd mm to both axis. This way i get to experiment with different caps.


/Kari

 

[steenoe]

Does anybody know the maximum pin distance of the caps and maximum width?

Max-Pin distance is 59 mm.
Max width is 38mm.

Steen

 

[promitheus]

So only the MCap series can be used on the board.
The Mcap Supreme is 106mm long so I guess its out of the question.
The Mcap are the white audiophile caps.
Without being 100% sure the prices should be
4,10-4,60 Euro for 10uF
8,65-9,10 Euro for 22uF and
10,95-12,30 Euro for the 33uF
I could also organise some Mills resistors for the power resistors.
What are you guys using there.

 

[metalman]

Originally posted by promitheus
The Mcap are the white audiophile caps.
Without being 100% sure the prices should be
4,10-4,60 Euro for 10uF
8,65-9,10 Euro for 22uF and
10,95-12,30 Euro for the 33uF
I could also organise some Mills resistors for the power resistors.
What are you guys using there.

I used 10uF Solen caps, and my output response is less than +/-0.1dB from 20Hz-20kHz. I can't remember the exact numbers, but -3dB point at the bottom end was around 2Hz when driving a 1kohm input impedance. I don't think there is much benefit going to higher rated capacitors.

For the power resistors, I ended up used Kiwame, but I also gave the Mills a serious look too.

Cheers, Terry

 

[promitheus]

In my last preamp I used Metal Oxide Resistors.
In this one I want to use better parts. I want to use Mills Resistors.
I am thinking of matched Mosfets. I already have a lot of them matched. Panasonic FC for the Mainboards and Panasonic snap in for the power supply.

btw can the boards handle snap in caps?
They need I think 2mm holes.

 

[trango]

I'm trying to decide what impedance I should use for the volume attenuator (RelVol3 from dantimax). Standard values are 5k, 10k, 20 k, 50 k and 100 k.

Any suggestions?